AC blows hot

Tiny
DAVID058
  • MEMBER
  • 2003 ACURA TL
Air Conditioning problem 6 cyl Front Wheel Drive Automatic 96k miles

Ac blows only cold with the ac button on no matter if you turn the dial from 60 to 90. If you turn the ac button off the you have hot air no matter if you turn the dial from 60 to 90. What could the problem be and what to look for to do it myself? Any help would be appreciated. I have a code reader that I can use to check. There were not any lights on on the dash. Also, I do not have nav. If that code reader is not what you mean then sorry, could you be a little more specific about finding trouble codes. Thanks
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Sunday, July 18th, 2010 AT 10:07 AM

11 Replies

Tiny
KHLOW2008
  • EXPERT
Hi david058,

I would suggest doing a self diagnostic to check for trouble codes first. Is your vehicle equipped with navigation system?, the self diagnostic is inbuilt in the control panel and here are the procedures. Let me know what you find.


http://www.2carpros.com/forum/automotive_pictures/192750_HVACSelfDiagnostic03TLFig09_1.jpg



HOW TO RETRIEVE A DTC

1.Turn the ignition switch ON (II).

2.Press the AUTO button and then the OFF button. Continue to hold both buttons down for 1 minute.

If there is any abnormality in the system, the temperature indicator will light up the segment (A through N) corresponding to the error. The temperature indicator will then alternate every second between displaying "88" (all segments lit) and the error code segment (A through N).

NOTE:
The system will only display the DTC when the AUTO and OFF buttons are pressed. If you release the buttons, the display will go blank. To return the display, simply press the AUTO then the OFF buttons again.

If there is no abnormality, the segments will not light up.


http://www.2carpros.com/forum/automotive_pictures/192750_HVACSelfDiagnostic03TLFig10_1.jpg



Resetting the Self-diagnosis Function

Turn the ignition switch OFF to cancel the self-diagnosis function. After completing repair work, run the self-diagnosis function again to make sure that there are no other malfunctions.

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Monday, July 19th, 2010 AT 8:27 AM
Tiny
DAVID058
  • MEMBER
Thank you for the info on how to diagnose the ac myself. I followed the instructions and display started to blink back and forth between 88 and what appears to be letter I on the diagram. What is this and what to do to fix? I am very good at working on cars and with my hands, just need a little direction and help. Thanks, david
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Monday, July 19th, 2010 AT 8:31 PM
Tiny
KHLOW2008
  • EXPERT
With the skill that you have, this should be a breeze.

DTC INDICATOR LIGHT I: AN OPEN IN THE AIR MIX CONTROL MOTOR CIRCUIT

1.Disconnect the air mix control motor 5P connector.

2.Disconnect climate control unit connectors A (12P) and B (20P).

3.Check for continuity between following terminals of climate control unit connectors A (12P) and B (20P) and the air mix control motor 5P connector.


http://www.2carpros.com/forum/automotive_pictures/192750_HVACSelfDiagnostic03TLFig39_1.jpg



http://www.2carpros.com/forum/automotive_pictures/192750_HVACSelfDiagnostic03TLFig40_1.jpg



Is there continuity?

YES -Check for loose wires or poor connections at climate control unit connectors A (12P) and B (20P) and at the air mix control motor 5P connector. If the connections are good, substitute a known-good climate control unit, and recheck. If the symptom/indication goes away, replace the original climate control unit.

NO -Repair any open in the wire(s) between the climate control unit and the air mix control motor.

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Tuesday, July 20th, 2010 AT 6:55 AM
Tiny
DAVID058
  • MEMBER
Thank you so much for responding. I will check it with my multi-meter today. I have read that this is a common problen with the mix motors on these cars. I know that I will be pulling the ac control panel out but where is the air mix control moter located if I need to swap it out? Between the mix motor and the control panel it sounds like I hope its the mix motor part because it should be cheaper. Any advise would be appreciated
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Tuesday, July 20th, 2010 AT 8:28 AM
Tiny
KHLOW2008
  • EXPERT
These diagrams should be able to assist you.


http://www.2carpros.com/forum/automotive_pictures/192750_AirMixMotor03TLFig044_1.jpg



http://www.2carpros.com/forum/automotive_pictures/192750_AirMixMotor03TLFig134_1.jpg

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Tuesday, July 20th, 2010 AT 8:41 AM
Tiny
DAVID058
  • MEMBER
Sorry so long to respond but first chance I got to look. Please correct me if im wrong and advise me what to do next. I hope you can help. Metered continuity by puting 1 lead on each of the 5 pins and the other on another wire in the other connectors. This is what I got. If wrong please help
5 pin harness
#1 to 2 on 12 pin. Tone
#2 to 7 on 12 pin. Tone
#3 to 7 on 20 pin. Nothing
#4 to 6 on 20 pin. Nothing
#5 to 15 on 20 pin. Nothing

#2 on 12 pin to ground. Tone
#7 on 12 pin to ground. Tone
whats next please. Thanks
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Monday, July 26th, 2010 AT 5:59 PM
Tiny
KHLOW2008
  • EXPERT
#3 to 7 on 20 pin. Nothing
#4 to 6 on 20 pin. Nothing
#5 to 15 on 20 pin. Nothing

Above indiates there is an open between the climate control and the air mix motor.

You need to check if any of the wires have bad connections or is broken somewhere.
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Tuesday, July 27th, 2010 AT 9:28 AM
Tiny
DAVID058
  • MEMBER
Sorry to get back so late, but I wanted to let you know what the prob was. I traced down the wires to the mix motor and I saw that there was basically a metal post that was to travel inside a path I would say and it was out of the track. When I turned on the ac and changed the climate I saw the rod moving but not where it was suppose to be. Without your help I would not have trouble shot it that way. Thanks for all your time and I hope if needed you can help me again
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Monday, August 2nd, 2010 AT 2:49 PM
Tiny
KHLOW2008
  • EXPERT
Glad to know you have fixed the problem.

You know where to look for us if required.

Thank you for using 2carpros and have a nice day.
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Tuesday, August 3rd, 2010 AT 6:46 AM
Tiny
BARNESG
  • MEMBER
  • 2000 ACURA TL
  • 130,000 MILES
My kid has a 2000 Acura TL. The blower is blowing. The fuses appear to be fine. Wondering if it might be thermostat? We called an auto-electric company that thought it might be a switch (flap) that converts the heat to a/c but that doesn't sound right. You would think it would blow either hot or cold, but it does neither.
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Monday, November 20th, 2017 AT 5:01 PM (Merged)
Tiny
HMAC300
  • EXPERT
This is the motor he is talking about the air mix motor, it's under the heater. What happens is the flap controls howmuch hot or cold air is put into the car. As long as both heater hoses are hot when car is warmed up then it likely to be this or the switch isn't sending power to it. Pic enclosed.
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Monday, November 20th, 2017 AT 5:01 PM (Merged)

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